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clare21
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BIOS recovery after power outage

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HP All-in-One 22-c0xx
Microsoft Windows 10 (64-bit)

I was able to restore the BIOS in my new computer.  Recently, there was a power outage while my pc was OFF.  But after turning pc on, this same message in blue screen appeared again...'The CMOS checksum is invalid...'  So i followed the same procedure to recover the BIOS again.  It worked.  Now i'm wondering is it normal that i have to restore the BIOS every time after a power outage??  Thanks!

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Lil_Boy_Blue
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Lil_Boy_Blue
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Hi

The BIOS is maintained by the CMOS/RTC battery usually and it may need replacing.

 

Which COxx is it?

 

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clare21
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Thank you for your reply.

 

So i need a new battery?...but i just got this brand new less than couple months ago ☹️

 

It's 22-c0009

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Lil_Boy_Blue
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Hi

 

Not quite what I said...

 

Usually, not all PC's have a CMOS/RTC battery and its job is to maintain the Time Date and options like secure boot or boot sequence.

 

So if your PC was unplugged, same as a power outage, cept for any surge or spike, does it need fixing after being plugged back in?

 

Probably all is fine with with it.

 

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clare21
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Hi, thank you for your reply.

 

Last time i unplugged it for about 3 hours ...'The CMOS checksum is invalid.' message appeared again when i power on my pc.  All i did was recovering the BIOS again...that's it...no other fixing.  

 

The first time after restoring the BIOS, i did unplug it just to see if that message will pop up again and it didn't.  But i don't remember how long i unplugged it for though.  I will unplug it again tomorrow and see how it goes.

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Lil_Boy_Blue
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Hi

I cant pin down your model...

Matching products for United Kingdom (22)


SKU: if possible by this method
WinKey + R and type
msinfo32
Read Line 9
System SKU: N6K07EA#ABU

Please do not post Serial Numbers.

 

The CMOS/RTC is also supported by a small capacitor in some cases that is sufficient for a short dis-connection, but not a lengthy one.

 

https://www.newegg.com/p/pl?d=cmos+battery    a dollar 49 cents (US) whatever that is in rea£ money.

 

EG:

https://support.hp.com/gb-en/product/hp-22-b100-all-in-one-desktop-pc-series/12079713/document/c0513...

 

The silver button marked K T S is what I am meaning.

 

 

 

 

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clare21
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Hi...thank you for your reply.

 

System SKU : 3LA38AA#ABL

 

So i tried unplugging it for just half hour today and that same 'CMOS checksum is invalid' message popped up again. 

Is it okay to just keep restoring the BIOS whenever my pc needs to be unplugged/power outage etc.. ??

 

Thank you.

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Lil_Boy_Blue
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clare21
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Hi.. thanks for your reply.

 

So i contacted support and was told that i need to ship my pc for repair.  I should've just return it back to the shop for an exchange in the beginning...so much easier. 

 

Anyways... thank you very much for your time!

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Lil_Boy_Blue
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Prego.

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